Improved mode of blasting rocks



. Georgia, have inventeda new'and useful Im- .being had -to the annexed drawing, said l pose in com-ing'zin contant-With the side of the the ignition of the powder.

charge of two d ii'erentv diameters, the lower vision-plate and spindle applied andy-ar-v inch in size being used, thev larger drill iirst,

UNITED STATES PATENT OFFICE.

JOHN GILLEL-AND, OF ATHENS, GEORGIA.

lMFROl/ ElB vMODE lOF BLA'STING ROCKS.

4Specification forming part of Letters Patent No. 30,809, dated December Il',

To d/ZZ whom it' may conc-em.;

Beit `known that I, J 01amv 'GILLELAnnof Athens, in the; countyl of Glarkand State of provement in Blastin Rocks;and I doherf'e-"Zl by declare that .the following is a full, clear, and exact description of the same, `reference.

drawing being a verticalsect-ionof a` rock. drilled and charged according-to m-yinvention.

The object lof this --invention is `to ,prevent accidents, which frequently loccur .in :blasting rocks, owing to thetamping of the wadding overl the charge oflpowder in ltheV hole, the metal rod 4necessririq employed for thepur-` hole developing parks. of' drel which cause The invention 'consists in having -the hole which is drilled in the rock to receive the part of the hole, which receives the powder, being smaller in diameter than theupper part, which receives lthe'wadding,v and using a di ranged in the vvhole substantially 'as hereinafter described, whereby the wadding jnaybeplaced inthe hole and tamped beforethefr vinsertion of the powder, and .all accidentelv avoided. To enable those .skilled in the art to -lfullyj understand and practicc-myi-nvention, tI will proceed to describe it.

drilled in it tov receive vcharges forf'blasting it. These holes, it will lhe' seen, are .each'of two dierent diameters, the upperpar'ts,a', .l being somewhat large'r thantheflower parts, b, drills varying from" a quarter-to a' half# and then the smaller one. I. The lower parts, b, of the holes are made 'suflciently deep tol receive the necessary -charge of powder,and theup'per parts, 0., are drilled sufficiently deep to receive a'requisite amount of 'wadding to, properlyconne the powder. i' After the holes a'r'e drilled and properly 'cleaned out, a plate, C, of metal or other' suitablefsubstance, is

.placed in the holes, said,v plates'restiig-on'the 1 Shoulders@"Whiehereiformefhby theeiffera .ence 1n the diameters of the two parts a b of The plates Gare .tapped at their.-

rammed down, so'as 'to -prevent' being blown out.. The spindles D are then' u'nscrewe'd from the plates C and withdrawn, 'and ahole, d',

will conseq'uently 4loe at the centerof lthe wadding in each hole in therock, (seehole B and a funnel, E, is placed-in the oriiccsofthe lholes d, and the lower parts, b, of the holes'- are charged withfpowder-e. A fuse, f, may' y then befinsertedin each holed," andthe charge will be seen that ne adcideht can possibly oefv cur-in -tamping or rai'nnling".- down the wadding, for such work, -is done'. before the pow' der'is inserted in the hole, vandthe wadding j canv therefore be "rammed downwithf greatv force, so'as to electually 1`)rev ent..thecontiny other-advantage.attendingthis-invention, and

that is the lower parts, b',"o'f "the hole'maybe. .made sufficiently deep to allow aspace' above the powder,between it and the plate Cio-admit ofthe expanding of the gases when vthe pow? 'der is ignited, andfthereby enabling the latter.

to ajct more efficiently than it otherwise'wuld..

The" invention is a extremely simple l'well as useful one, and will not add in an apy preciabledegree tothe usual cost. of'blasting y .I would remark thatthescrews-at'theends-L of the spindles may be dispensedwitii', and.

1 the spindle merely'tted inthe plates.e f. -Having thus describednly invention,w hat'I claim4 as new, and desire to 'secure l 1y I ietla'ers'` Blasting rocks having thejhblewhich.

receives the charge v'of two dlerentmdiameters, the smaller one, b, to receive' the powder,

. and the larger one, a, to receive the waddingj and using i-n connection`therewith a plate, C',.

.fand spindle D, respectivelyapplied'and ma;

nipulated substantiallyas'set' forth.

f- Witnesses,

= G. MQWHORTER.

JoHN GILLnLANDi-f 

